I really want to change some of the icons (as described in the 'tip' the other day) but I have a couple of questions?

1) If I want to make custom icons for some apps what size do they need to be?
2) Is there any way of changing the icon of a web page in the launcher? - For example I have the BBC mobile site saved in my launcher and would like to change the icon to the BBC logo but I'm not sure this is possible or where I would find the original icon .png file to swap it over.

Any help would be really good.

Thank you

~ icklepriest ~

"Jesus you,
Gave what the world couldn't offer us.
Say what they want,
Say what they want,
We are free!!!"